Roll-edge stitcher



:July s ,1926. 1,591,115

` M. DUBlcK ROLL EDGE STITCHER MICHAEL Patented July Y6, 1926. Y l.) vUNITE DUBICK, onI 'HICAGO, finnois,

no LnnneE. s'rrroirnn..

' aepncanonaldlnay16,1925. serial NQ; ansia@ l 'Y 'This invention relates to the vmattress making art, and more especially to sewing machines for stitching the so-called roll edge part ofy the mattress.l The.. usual method of stitching these edges is to place the mattress on a Atable correspondingsubstantially in vsize with the mattress', and then understood 'by those acquainted with the art and 'skilled .inimattress*making, said machine-being power operated, asby means ofan; eiectric motor., .For the purpose "ofj this invention,y Whichv is confined merely to a Vdetail of the mattress ffeed and stitch-L ing mechanism proper, vit is deemed sufficient to show merely that partl of the machine which is immediately concerned,jand Which' directly involves the improvement here claimed.; In the; machines heretofore used,

themattressholding and feed'mechanis'mvvlr includes a pair of pointed ngers,"both of Which are tiltably mounted andV are operative to 'coact with each otherand. engage` the mattress .edge for holding. it While the stitch is-being made. The operation,fhow

f;ever,*ofthis form of mechanism is-not al- '.-are to provide an improved form of mat-v together satisfactory for the reason thatv the sharp pointed fingers enter thefabric .and leave permanent marks thereon, andl sometimes tear thefabric.` The Vmain objects of he present invention tress holding .and vfeed mechanism, adapt ed to avoid tearing or permanently marking the fabric ofthe goods, and more especially to provide a fabric engaging member adaptl ed to bear against the upper side of thefrol1 edge in a form and mannerto effect a clamping'contact, as distinct from a perforating grip on lthe goods. A furtherobjectis to provide either or both of the rollholding fingers With blunt faces to grip the fabric..

An illustrative embodiment of this. in-

vention is shovvn by the accompanyingV 1 drawings, in Which l Figurel is a front elevation of that part of Vthe device to which .this invention applies. l'

Fig.

Figf is ay front elevationor face view of the upper clamp broad, roughened frictionface.

2 is a greatly enlarged fragmentary detail of thel` gripping mechanism andV member showing the'v @Thearms lassises-oafTo nirsrniifarafrrlnnfss 'otar-v rangos onrcneo, Immers. Aconroaarron or, runners- Fig. bisafrontelevation, yon-aimuch reduced scale,Y of that part off the machine `n /hich .embodies this invention, g in its'rela-j tionto the mattressfand t'ablewvhichare hereshoivnin verticalfcross section.

Figsb land 6 show modifications', 1n the.V vi vdetails of the roll holding finger tips.

The 'device herein shown'andfclaim'e'd is applicable to machines .substantially simif lar in' general character to those shownby and 155199299, of 1924s andReissue Nm 15,373; -of 1922,4'and the present 'invention `may 'be regarded' asiannmprovement over the mattress 'stitching means shown by said patents. f

' In theV Vconstruction shown sides respectively ofthe roll-'edge 4 of the Y mattress 5. These-fingers Zand 3 are tiltably mounted on medial pivots 6 carried byapairiof movablefarms '7 'in mutually spaced relation to admit the roll edge 4 when said fingersf 'are *swung 'apartfv The` outer' ends of said ngers :are pvotally connectedat 8 to oper'atngfarms 9, which are actuated in the usual mannerk of such machinesyasvvill be understood by'those'acquainted Withthe art.

VReferring be noted that',.its' -fabric gripping-part vr10, in-

to the upp er finger 2, itis to stead of being pointed, is not. only blunt but ratherlbroad-and Vflattish .in'character, With a roughened .face adapted topreventslippage -of the material.V When forced into contact therewith by. means of the opposite finger 3, Which pushes the fabric up from j; thc Vunder side and holds it While the needle 11 shown in Fig. 2 is operated.v Referring to Figs. 2 and .3, Where this friction fgrip finger 2 lis .shown-"on la 'largefscale, it isto be notedlthat..the1broad,.flat ybearing part y10, Whi'chengagestheroll edge 5,liesina` plane at right Vangles tothe general. plane of said finger'. The active facejofthis part y10 is` corrugated by horizontal` ridges`10f extending cros'svvisefofthe nger. Part of these ridges are notchedaty 1 0 Vin alinement to accommodate the tip of the opposite finger' 3 when `the mattress is gripped;

7 are pivote d at their upper enfile alsVA I es i tremities at a point 12 which is movable up and down. The arms 9 are fastened in a Suitable manner atv their upper extremities to a common support with the pivot 12. InV

operation, both arms 7 and 9 are moved downwardly ,togetherV until a certain position isreached where vthe arms 7 cometo a reist while arms 9 fcontinuetheir downward movement, causing the active inner vends of viso the fingers 2 and 3 to move inwardly on the fulcrnms 6 and engage the roll edge 4, hold-V ing it imposition for the needle to penetrate the same and draw inthe thread'll in making a stitch. Then the pivot point 12 comes Vto rest, theY arms 9 are allowed to move downwardly against the tension of the 'springs 13.

When said head moves forward it mustbe raisedV clear ofthe mattress. The iirst down'- .substantially plain. y'form or" inger'face 19v isshown.

as distinct from a point, and these faces' which may be roughened in any effective manner when so required are here'shown In Fig. 6 a knurled Although but one specific embodiment of this invention is herein shown and described, it is to be understood that numerous details of the construction shownV may be altered or omitted without departing from thespirit` of the invention as defined by the following claims. Y

I claim v i 1. In a stitching machine oit the class vdescribed, two' oppositely disposed pivotally nonnted iingers, means 'for advancing and rotatingthe lingers to move the ends 1nwardly, the end of one of said fingers' having a fiat surface vfor opposing'tlie end of g the opposite finger. Y.

2. In a stitching machine of the class described, two oppositely disposed pivotally Vmounted fingers, means Vlfor advancing and rotating the fingersto move the ends 1n-V wardly, one of said fingers having a blunt fiattened end having a roughened surface.

Signed at Chicago this 6th. day of May 1925.

MICHAEL DUBICK. 

